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What do you mean by atomicity and aggregation? Atomicity : Either all actions are carried out or none are. Users should not have to worry about the effect of incomplete trans
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
what is the need of a log in dbms
Aggregation : One limitation of the E-R diagram is that they do not permit representation of relationships between relationships. In such a case the relationship along with its ent
What is foreign key? A relation schema r1 derived from an ER schema may contain among its attributes the primary key of another relation schema r2.this attribute is known as a
What is an Index? An index is a small table having only two columns. The first column has a copy of the primary or candidate key of a table and the second column having a set o
We face problem of stock Opening balance and closing balance in Minus
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
cardnality ratio for humanresource mangement system
Describe the responsibilities of the DBA and the database designer ? The responsibilities of DBA and database designer are: 1. Planning for the database's future storage needs
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